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What is cerebrovascular reserve?
Cerebrovascular reserve capacity (CVR) describes how far cerebral perfusion can increase from a baseline value after stimulation. Measurement of cerebral blood flow (CBF) can be done by PET or SPECT.
What is hemodynamic resistance?
We propose that hemodynamic resistance, defined as the mean pressure gradient across the valve divided by mean flow rate during systolic ejection, gives a better indication of hemodynamic obstruction. Resistance was higher in proportion to area when flow and pressure gradient were high.
What is hemodynamic function?
Hemodynamics or haemodynamics are the dynamics of blood flow. The circulatory system is controlled by homeostatic mechanisms of autoregulation, just as hydraulic circuits are controlled by control systems. The hemodynamic response continuously monitors and adjusts to conditions in the body and its environment.
What is hemodynamic of heart?
Hemodynamics: the study of blood flow. Heart rate (or pulse): the number of times a heart beats in a minute. Stroke volume: the volume of blood pumped by a ventricle each time it contracts. Cardiac output: a measure of how efficiently the heart moves blood through the body.
What is CVR in blood?
Cerebrovascular reactivity (CVR) is a measure of the health of brain blood vessels; assessment of this quantity can help determine the location and extent of impaired blood flow to the brain, and determine the need for treatment.
What is a CVR stroke?
Cerebrovascular reactivity (CVR) is the change in cerebral blood flow in response to a vaso-active stimulus, and may assist the treatment strategy of ischemic stroke.
What is hemodynamic load?
Normal blood flow is essential for proper heart formation during embryonic development, as abnormal hemodynamic load (blood pressure and shear stress) results in cardiac defects seen in congenital heart disease (CHD).
What is hemodynamic status?
Haemodynamic stability is the medical term used to describe a stable blood flow. If a person is hemodynamically stable, it means that he/she has a stable pumping heart and good circulation of blood.
What is hemodynamic regulation?
hemodynamic regulation in the nursing interventions classification, a nursing intervention defined as optimization of heart rate, preload, afterload and contractility.
What means hemodynamic?
In medical contexts, the term “hemodynamics” often refers to basic measures of cardiovascular function, such as arterial pressure or cardiac output. In the present review, “hemodynamics” refers to “the physical study of flowing blood and of all the solid structures (such as arteries) through which it flows” (64).
What is CVR disease?
Abstract. Background: Aberrations of cardiovascular reactivity (CVR), an expression of autonomic function, occur in a number of clinical conditions, but lack specificity for a particular disorder. Recently, a CVR pattern particular to chronic fatigue syndrome was observed.
What is cerebrovascular conductance index?
Cerebrovascular conductance index is a measure of the conductance of peripheral blood pressure to cerebral blood velocity and is calculated as MCAv/mean arterial pressure (MAP) [45].
What is RC (reserve capacity) on a battery?
Reserve Capacity (RC) RC is a general indicator of how long a new, fully charged battery can continue to operate essential accessories if the vehicle’s alternator fails.
What is haemodynamic response and why is it important?
Haemodynamic response is vital to fMRI and clinical use because through the study of blood flow we are able to examine the anatomy of the brain and effectively plan out procedures of the brain and link together the causes of degenerative brain disease.
What is a 25A reserve capacity rating?
A reserve capacity rating tells you the reserve capacity of a battery. The higher it is, the longer it can sustain voltage. An example measure for reserve capacity would be RC @ 25A = 160 minutes. This means that at 25 degrees Celcius, the battery can supply 25 amps for 160 minutes before the voltage drops.
What is the meaning of reserve capacitance?
Reserve capacit y is the amount of time measured in minutes a fully-charged battery can be discharged at 25 degrees Celcius at 25 amps before the voltage drops to 10.5 volts. A reserve capacity rating tells you the reserve capacity of a battery.